Indian Navy SSR Kinetic Theory of Gases — practice questions

Explore 2 free Kinetic Theory of Gases questions in Indian Navy SSR Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Kinetic Theory of Gases questions and exercises with answers

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Postulate of kinetic theory: gas molecules:Read the answer and worked solution →Mean free path doubles when:Read the answer and worked solution →

Worked practice questions

Postulate of kinetic theory: gas molecules:

Have fixed positions
Are in random rapid motion; collisions are elastic
Are stationary
Stick together

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Correct answer: B. Are in random rapid motion; collisions are elastic

KTG postulates: (i) large number of identical molecules in random motion (ii) elastic collisions (KE conserved) (iii) negligible molecular volume (iv) no inter-molecular forces (except during brief collisions).

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Mean free path doubles when:

Density doubles
Pressure halves at constant T (or density halves)
T doubles at const V
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Correct answer: B. Pressure halves at constant T (or density halves)

λ ∝ 1/n (number density). Halving P at const T halves n → doubles λ. **Hence high-vacuum:** extremely long λ (atoms travel meters between collisions).